package stringday01;
/**
 * String和String
 */
public class StringStringBuilderDemo {
    public static void main(String[] args) {
        String s = "a";
        StringBuilder builder = new StringBuilder(s);

        for(int i = 0;i<1000000000;i++){
            builder.append(i);
            System.out.println(builder);
        }
        System.out.println("结束");
    }
}
